Small random-orbit or pad sanders make this job go faster. (Wallis first covers these boundaries with Synkoloid patching compound so no edge is visible after sanding.) As shown, you want to make sure that there is a feathered, smooth transition from exposed wood to old paint. For areas that might get close scrutiny, you can follow up with a 100- or 120-grit rubdown to erase any scratches.
"I hired Tom Richardson to paint the soffit and fascia on a rental house I have in CO. He did an excellent job and even did touch up painting after new gutters were installed. I also hired him to paint the interior of the house and act as my General Contractor for remodeling the entire house. He hired excellent skilled pros to do the remodeling and Tom and his crew did the painting. It worked great for me because I had only one person to coordinate with. His guys did a great painting job and even came back to do touch ups after carpet was installed. Tom is: diligent, honest, friendly, does what he says he is going to do, charged me reasonable rates, followed up to make sure the work was done perfectly, and is an all-around nice guy. I would highly recommend him. The house looks great and is now on the market for sale."
Every painting job develops a unique choreography as ladders go up and come down and tarps are unrolled and folded up. But two basic principles remain: 1) Start at the top and work down. 2) Work in the shade, out of the sun's glare. As the dance proceeds, keep an eye on the weather. Rain can wash freshly applied latex right off the wall, and a temperature dip below 50 degrees F two days after application can interfere with adhesion and curing and dull the sheen of glossy paints. (Latexes like Sherwin-Williams's Duration and Benjamin Moore's MoorGard Low Lustre are formulated to tolerate temps as low as 35 and 40 degrees, respectively.)
Even if you think you'll probably do the job yourself, it's good preparation to seek estimates from professional exterior home painters near you. Then you'll have a financial point of comparison and you may benefit from what a home painting contractor has to say about the condition of your home, color choices and types of paint available. Let the painter make his pitch for a professional job before you decide what to do. You can still opt to do it yourself while having learned something worthwhile. Arvada House Painting